Patent US3837425A successfully refreshed from Google Patents.
US3837425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Edge-damped diaphragm for electrodynamic loudspeakers
Assignee: Bozak Inc
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Filing: 1973-06-11
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Granted: 1974-09-24
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Expires: 1993-06-11
Abstract
Abstract A diaphragm having a damping member formed of soft rubber compressed and retained at its outer periphery by a crimped flange to damp undesirable vibrations in the diaphragm.
Inventors
- 👤 R Bozak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:57
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/26; H04R7/16; H04R7/18; H04R7/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
A loudspeaker diaphragm comprising a thin, lightweight sheet and a damping member retained and partially compressed at the outer periphery of said sheet by a crimped flange.
Claim 2
Dependent Claim
27 words
A loudspeaker diaphragm comprising a thin, lightweight sheet and a damping member retained and partially compressed at the outer periphery of said sheet by a crimped flange.
Claim 3
Dependent Claim
39 words
A loudspeaker diaphragm according to claim 1 wherein said sheet has an annular rim, and at least a first portion of the bottom surface of said damping member is adhesively secured to the upper surface of said annular rim.
Claim 4
Dependent Claim
51 words
A loudspeaker diaphragm according to claim 2 wherein said sheet has a vertical step extending from the inner periphery of said annular rim, and a second portion of the bottom surface of said damping member is adhesively secured to at least a portion of the inner face of said vertical step.
Claim 5
Dependent Claim
15 words
A loudspeaker diaphragm according to claim 1 wherein said damping member is of annular configuration.
Claim 6
Dependent Claim
16 words
A loudspeaker diaphragm according to claim 1 wherein said damping member is formed of soft rubber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |